<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title> 将 obejct 对象中属性是空字符串的替换为 null</title>
</head>
<body>
    <script>
        var num={
            age:'naa',
            name:' '
        }
        //交换数据
        var array=JSON.stringify(num)
        //替换
        var arr=array.replace(' ',null)
        //交换数据
        var num =JSON.parse(arr)
       console.log(num)
    </script>
</body>
</html>